The following is a list of housemates in the fifteenth series of Big Brother UK.
Ashley "Ash" Harrison, aged 26, is a model from Manchester. He entered the house on Day 2. On Day 11, when Power Housemate Chris was choosing his next nomination, he narrowed his decision down to Ash and Kimberly. To find out who was Chris' biggest threat in the house, a poll was posted on the official Big Brother app. As Ash topped the poll, Chris decided to choose him as his next nomination therefore Ash automatically faced the second public vote. He survived eviction on Day 16 having received the least number of votes to evict along with Christopher, however he was nominated for the next public vote after Power Couple Matthew and Toya chose to void his nominations. He survived eviction on Day 23 despite receiving the second highest number of votes to evict. He was automatically put up for the fourth eviction when the girls became Girl Power and took over the house. He survived this eviction on Day 30. Ash was nominated for the sixth eviction on Day 40, however in a shock twist it was revealed that the housemate who received the most nominations would be immediately evicted. This housemate was Marlon. Shortly after the eviction it was announced that all of the remaining housemates except Helen would face the next public vote. However this was a lie and the decision was actually down to the three new housemates; Biannca, Pav and Zoe. On Day 44, they decided to save Ash from eviction. Ash was nominated for the fifth time on Day 47 after the Power Alliance; Ashleigh, Chris and Mark chose to nominate him. In a nominations twist on Day 48, Ash saved himself from eviction and replaced himself with Ashleigh. He survived the final set of nominations on Day 61 meaning he had secured himself a place in the final. On Day 68, the Power returned to the house for the final time and was given to Ash and Christopher. For their first mission as Power Housemates, they had to choose questions for Big Brother to ask their fellow housemates in the Diary Room. The same day, following Helen's "surprise eviction", Ash and Christopher were then given the power to evict one more housemate. They chose to evict Chris. However, unbeknownst to them and the other housemates, Helen and Chris' eviction was fake and they were actually living next door in Big Brother's Spare Room watching the housemates' every move. This was eventually exposed on Day 69 when they returned to the house. Ash finally left the house during the final on Day 72 after finishing fourth.
Ashleigh Coyle, aged 18, is a model and boutique shop worker from Derry. The youngest housemate of the series, she was the winner of Miss Derry 2013. She entered the house on Day 2. She became part of Girl Power on Day 23; where all the girls had the power. They were told that all of the boys would automatically face eviction and they'd have 72 hours to decide which of them to save from eviction. On Day 26, the girls decided to save Chris, Marlon and Steven from eviction. After this decision, their power trip ended. On Day 32, Ashleigh was nominated for the first time by her fellow housemates. She survived this eviction on Day 37 despite receiving the second most votes to evict. On Day 39, Ashleigh was nominated by her fellow housemates but was saved in a shock twist on Day 40 after it was revealed that the housemate who received the most nominations would be immediately evicted. This housemate was Marlon. Following his eviction, all of the remaining housemates except Helen were told they automatically face the next eviction. However this was a lie and their fate actually stood in the hands of the new housemates; Biannca, Pav and Zoe. Ashleigh was saved from this eviction on Day 44.